This project came about from a need to line bore some bearing housings for an alternative energy project I am planning using the stepper motor from a New Zealand designed Fisher & Paykel smart drive washing machine. New Zealand fully metricated in the 1960's so all the dimensions are in mm except where related to the 1/4 in. high speed steel tool bit used. The boring bar is designed to bore holes from about 40mm up to 80mm diameter, photo 1. For smaller holes the dimensions can be scaled down and a smaller tool bit used. You can make the bar any length to suit your particular purposes. I made mine 400mm long with the position of the cutter off centre about 50mm towards the tailstock end. The basic design of the adjusting mechanism can also be used for a collet mounted boring head for the mill.
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